{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5b387e052cff3d9c9e582900eb8f6f72be989e1f6ea4ff50a14415b1db8f6b00",
    "signature": "0xb018056c2ee211e4f589a631e9a414516d8ff7fe6da77a9b2d69a5f47fad309e58061937cbacb06dcbb6bb02443a501b34d54eae3f251b67a187aff7611efcdd1b",
    "signer": "0x0de69a50505F6FD476Ce68575aEbDec1b03F396F",
    "userId": "953141032"
  }
}